Advice Please

Girl (16f) and I (15m) have been good friends. Before I confessed to her we would talk daily and message constantly. The vibes were great. After I confessed to her and the feelings were reciprocated it felt as though we weren’t messaging as much and the vibes were off. I brought this up with her and we started talking more than we had been but still not as much as pre-confession. We kept this up for a bit but it just feels like she isn’t into me anymore. Her replies take hours, she doesn’t initiate the conversation, and when we do talk the vibes are just completely off. I’ve just now seen her like on a reel that read “looking at him knowing I’ll have to eventually move on because it’s getting embarrassing even to myself”. That was the nail in the coffin. I don’t know what to do or how to feel and need advice please.